Incandescent lamp.



No. 696,100. Patented Mar. 25, |902.

P. m. .1. JUGE & A. E. amsn.

INCANDESCENT LAMP.

(Application filed Sept. B, 1900.)

(No Model.)

Fi ge.

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UNITED STATES PATENT OFFICEa PAUL MARIE JOSEPH .lUGE AND ALPHONSE EUGCNEGRISEL, OF PARS, FRANCE; SAID JUGE ASSiGNOR TO JOHN PETER PERSO/ll, OFNEV YORK, N. Y.

INCANDESCEN' LAMP.

SPECIFICATION forming part of Letters :Patent No. 696,100, dated March25, 1902.

Application fil To @ZZ wwnt it 77u03/ concern:

Be it known that we, PAUL MARIE JOSEPH JUGE and ALrHoNsn EUGENE Gursnn,citizens of the Republic ot France, and residents of Paris, France, havejointly invented cer tain new and useful Improvements in IncandescentLamps, of which the following is a specilication.

The incandescent lamp which forms the subject-matter of the presentapplication i'or a patent consists, as do all lamps of this class, of abulb in which a vacuum has been formed and in which in the interior isarranged a lilament of carbonaceous matter intended to be madeincandescent by the passage of an electric current.

The distinguishing feature of this lamp is that its bottom, in place ot'being, as is usual, a plaster stopper in which are inclosed and sealedthe ends of the platinum wires to which the filament is joined, isentirely of glass. The two platinum wires pass through the bottom andare solidly sealed in the glass and terminate outside the glass in twoexpanded heads or contacts through which the electric current can bepassed with certainty. In order that lamps of this sort with bottomsentirely of glass can be put in place, like ordinary incandescent lamps,in the fittings of lighting apparatus, the glass bottom ot the lamp iselongated into a foot or neck so arranged as to receive a metallic capxed by screwing or otherwise applied to said loot or neck. At the bottomof the cap or thimble there are two contacts secured or riveted in aninsulating-base, corresponding to and fitting against the heads orcontacts at the ends of the Wires of the bulb when the cap is in place.The lamp, entirely of glass, with this cap fixed by screwing orotherwise, can be used in an ordinary iitting or socket-for eX- ample, alitting or socket with a bayonetjoint.

The nature and scope of our invention will be more fully understood fromthe following description, taken in connection with the accompanyingdrawings, forming part hereof, in which with its internal iilament inplace. Fig. 2 is a side elevational view otl the interchangeable capdetached from the bulb. Fig. 3 is an external view of the complete lampwith the cap screwed on; and Fig. 4: is a section on the line N, Fig. 3.

The lamp consists of a glass bulb A, of any shape, iu which a vacuum hasbeen formed and which incloses a iilament of carbon or other materialadapted to become incandescent and to be bent into required form. Theends of the filament f are connected to two platinum conducting wires h,which pass through the glass foot or neck of the bulb A and arehermetically sealed therein, as at c. The platinum conductors h areprovided outside the foot orneck of the bulb A with shoulders or roundedheads d, insulated from each other by the glass of the bulb and fusedinto the foot or neck, thereby permitting a certain and intimate contactwith the contacts of the cap hereinafter described. At the top of itsglass toot the lamp is provided with a screwthread e, preferably formedin the glass itself and on which is intended to be secured by screwingthe cap B, which is shown separately in Fig. 2. In certain cases thelamp may be made with a bulb not furnished with a screw` thread, and thebase of the bulb may have a screwsring of metal or other materialsecured to it by plaster or other convenient cement, to which screw-ringthe cap B may be secured. The cap B may be formed ol' metal or any othersuitable materiaL-such as copper, glass, ebonite, wood, dre-and isprovided at its upper part with an internal screwthread g, of which thediameter and pitch correspond exactly with the screw e ot' the bulb ofthe lamp, so that the cap can be solidly connected to the base of thebulb simply by screwing on the cap. The bottom of the cap is a disk 7Lof insulating material, which is traversed by two buttons or contacts i,which are insulated the one from the other by the disk 7L. These twocontacts t' are intended to come exactly against the two plates orrounded heads d at the ends o the platinum conductors l) when the caphas been screwed home onto the bulb. The contacts t' are also intendedto make contact through their exterior heads with the metallic surfacesof the fitting or socket for the lamp. The cap is preferably providedwith two dia- ICO metrically opposite pins j, projecting from its base,which are intended to enable the lamp to be xed with a bayonet-joint toits fitting or socket.

For certain lamps or certain fittings, in which the conductors of thecurrent are one at the bottom of the fitting and the other at its sideand the incandescent lamp is xed otherwise than with a bayonet-joint,the cap may be arranged to correspond with the fit-A ting and thecontacts c' may be suitably placed.

The chief advantage possessed by the construction above described isthat the bottom of the incandescent lamp contains absolutely no plasterand the cap which is screwed into the foot of the glass bulb isinterchangeable and capable of being employed for other bulbs when thelatter are damaged.

f Having thus described the nature and object of our invention, what weclaim as new,` and desire to' secure by Letters Patent, is-

An incandescent lamp, comprising a bulb constructed wholly of glass andprovided at its base with an eXteriorly-screw-threaded closed foot orneck formed integrally with the 25 body of the bulb, twoconducting-wires sealed in the wall and base of the foot or neck andthereby insulated from each other, a h ead or button formed on each wireoutside the neck or foot, and a filament located within the 3o bulb andsecured to the conducting-wires, in combination with a cap adapted to bescrewed upon the exterior of the foot or neck, an insulating-disk formedin the base of said cap and two metallic contacts secured to said 35disk and adapted to register with the heads or buttons of the neck orfoot of the bulb.

In testimony whereof we have hereunto set lour signatures in thepresence of two subscribing witnesses.

Witnesses:

EDWARD P. MACLEAN, PAUL DE MEsTRAL.

